Node.js, often referred to as simply "Node," is a powerful open-source runtime environment that allows developers to execute JavaScript code outside of web browsers. It is designed for building scalable and efficient network applications, particularly on the server side. Node.js leverages a non-blocking, event-driven architecture, making it ideal for handling asynchronous operations and real-time applications. With its vast ecosystem of packages and modules available through npm (Node Package Manager), Node.js has become a popular choice for web development, microservices, APIs, and more, enabling developers to create high-performance applications with ease.
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Practice Test
21. What is a Node.js module?
A. A JavaScript file containing functions and variables
B. A directory containing HTML templates
C. A database table
D. A web server
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Answer: A JavaScript file containing functions and variables
22. Which built-in Node.js module provides functions for working with file systems?
A. http
B. fs
C. net
D. path
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Answer: fs
23. How do you include a module in a Node.js file?
A. By declaring it as a global variable
B. By using the import statement
C. By using the require function
D. By copying and pasting the module's code
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Answer: By using the require function
24. What is the purpose of the Node Package Manager (npm)?
A. To create HTML templates
B. To manage database migrations
C. To install, manage, and share JavaScript packages and dependencies
D. To define API routes
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Answer: To install, manage, and share JavaScript packages and dependencies
25. What is the default location where globally installed npm packages are stored?
A. /usr/local/lib/node_modules
B. /home/user/packages
C. C:\Program Files\nodejs\node_modules
D. /var/npm-global
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Answer: /usr/local/lib/node_modules
26. Which npm command is used to install a package locally in a Node.js project?
A. npm add
B. npm require
C. npm install
D. npm create
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Answer: npm install
27. What is the purpose of the package.json file in a Node.js project?
A. To store HTML templates
B. To define API routes
C. To specify project metadata, dependencies, and scripts
D. To manage database migrations
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Answer: To specify project metadata, dependencies, and scripts
28. How can you run a script defined in the package.json file using npm?
A. By using the npm script command
B. By executing the script directly with node
C. By using the npm run command followed by the script's name
D. By creating a separate shell script
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Answer: By using the npm run command followed by the script's name
29. What is a common use case for npm scripts in a Node.js project?
A. Handling database connections
B. Running unit tests, build processes, or application start scripts
C. Defining routing for web applications
D. Creating HTML templates
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Answer: Running unit tests, build processes, or application start scripts
30. What does the npm install --save command do when installing a package?
A. It installs the package globally.
B. It saves the package as a development dependency in the package.json file.
C. It installs the package as a production dependency in the package.json file.
D. It removes the package from the project.
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Answer: It installs the package as a production dependency in the package.json file.
